Soil · water · organisms · technology · labor · food systems

Agriculture

Agriculture manages biological production inside ecological, technical, economic, and social systems. Study the farm above and below ground: crops and animals, soils and water, machinery and labor, landscapes and markets, harvests and residues, short seasons and long-term stewardship.

Primary navigation · farm-system transect

Move from production systems into the soil, ecological, technological, and economic machinery that sustains them.

Every destination below is a direct peer in the curriculum. The two banks are only a visual grouping: production on the left, resources and management on the right. The open center keeps the whole-farm relationship visible.

Production systems
AGRAgronomy & Crop ScienceHow do crops, rotations, genetics, weeds, pests, water, nutrients, and weather interact across a field season?planned
HORHorticultureHow do propagation, protected culture, pruning, harvest timing, postharvest quality, and intensive management shape specialty crops?planned
ANIAnimal Science & Livestock SystemsHow do nutrition, genetics, health, welfare, housing, grazing, manure, and management shape livestock systems?planned
AQUAquacultureHow do water quality, stocking, feed, health, breeding, system design, ecology, and biosecurity shape aquatic production?planned
FORForestry & AgroforestryHow can tree systems provide products while interacting with soil, water, habitat, fire, carbon, crops, and livestock over long time scales?planned
Whole-farm system

Production sits inside interacting resource, ecological, technical, and economic layers.

Climate & waterweather · irrigation · drainage · extremes
Soil & ecologystructure · organisms · nutrients · habitat
Managed organismscrops · trees · livestock · aquatic species
Tools & laborpeople · machinery · sensing · infrastructure
Food-system contextmarkets · policy · processing · access
management links the layers, it does not control them completely
Resources & management
SOISoil Science & Nutrient ManagementHow do soil structure, organisms, organic matter, water, chemistry, erosion, and nutrient cycling constrain what can be grown?planned
ECOAgroecology & Sustainable AgricultureHow can managed landscapes use ecological relationships while negotiating production, biodiversity, pests, soil, water, and resilience?planned
TECAgricultural Engineering & TechnologyHow do machinery, irrigation, controlled environments, sensing, automation, storage, energy, and precision tools change agricultural work?planned
SYSAgricultural Economics & Food SystemsHow do risk, labor, land, markets, policy, processing, distribution, access, and externalities connect farms to wider food systems?planned
Nutrient instrument

Treat nitrogen as a set of pathways and tradeoffs, not three magic crop buttons.

normalized teaching units
Nitrogen pathways studio · normalized teaching model

Follow nitrogen through soil, plants, fixation, harvest, residues, and loss pathways.

This is a bookkeeping model, not a field recommendation. Real nitrogen rates and transformations depend on crop, cultivar, soil, weather, inoculation, organic matter, timing, fertilizer form, irrigation, rotation, yield, and many other conditions.

Current scenarioGrain legumesoil N + biological fixation
Normalized N ledgerTrack pathways, not prescriptions
Starting soil mineral + external input69
Loss pathways9
Soil-derived plant uptake60
separate biological pathway
Illustrative biological fixation contribution2
Plant N acquired62
Harvest export40
Retained residue17
Mineral N left in soil: 0 units. Residue removed rather than retained: 6 units.
Mineral N remaining0

current mineral pool after modeled loss exposure and plant uptake

Plant N acquired62

60 from soil + 2 from illustrative fixation

Harvest export40

plant N leaving the field in harvested biomass

Retained residue N17

organic residue pathway, not immediate mineral N

Legumes are not fertilizer buttons

Biological fixation supplies N to the plant system. Whether a legume increases soil N for a following crop depends on fixation, harvest removal, residue quantity and quality, decomposition, losses, and management.

Residues are delayed pathways

Retained plant N enters organic residues. Mineralization and immobilization unfold later, so this model intentionally does not dump retained residue straight back into the current mineral pool.

Loss is many processes

Leaching, denitrification, volatilization, erosion, runoff, and other losses respond differently to soil, water, timing, form, temperature, and management. One slider only represents aggregate pressure.

System questions · reference, not navigation

A productive field can still be a fragile farm system.

Agricultural decisions combine biology with uncertainty, time, resource constraints, labor, economics, infrastructure, environmental effects, and local knowledge. No single performance metric captures the whole system.

01ProductionWhat output matters, at what quality, through which biological system, and across what time horizon?
02Soil & waterWhich resources are limiting, where can losses occur, and what management protects long-term capacity?
03RiskHow do weather, pests, disease, prices, labor, equipment, policy, and biological uncertainty change decisions?
04EcologyWhich organisms and landscape processes support or compete with production, and which effects occur beyond the field boundary?
05TechnologyWhich intervention is useful at this scale, and what data, energy, maintenance, skill, or capital does it require?
06Food systemWhere do products go after harvest, who bears costs or benefits, and which constraints appear beyond the farm gate?